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Finding the Fourth Proportional to 85,479.34, 128,104.40 and 66,526.87

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Solution

The fourth proportional to 85,479.34, 128,104.40 and 66,526.87 is: 99,701.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,479.34 : 128,104.40 = 66,526.87 : x
  2. Step 2: Convert to fraction form
    85,479.34/128,104.40 = 66,526.87/x
  3. Step 3: Cross multiply
    85,479.34x = 128,104.40 × 66,526.87
  4. Step 4: Simplify right side
    85,479.34x = 8,522,384,991.81
  5. Step 5: Solve for x
    x = 8,522,384,991.81/85,479.34
  6. Step 6: Final answer
    x = 99,701.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.